package com.xsd.prc;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

/**
 * @Description:
 * @Author: zhoufuzong
 * @Created: 2021-01-03 12:00:27
 * @Version: 1.1.0
 */

/**
 * runable 接口中 执行 semaphore acquire（）,
 * 然后执行 具体动作
 * 最后 semaphore release
 */
public class SemaphoreDemo {
    public static void main(String[] args) {
        Semaphore semaphore = new Semaphore(3);
        for (int i = 1; i <=6 ; i++) {
            new Thread(()->{
                try {
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName()+"\t 抢占车位");
                    try{
                        TimeUnit.SECONDS.sleep(4); } catch(InterruptedException e) {e.printStackTrace();}
                    System.out.println(Thread.currentThread().getName()+"\t 离开车位");

                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    semaphore.release();
                }
            },String.valueOf(i)).start();

        };
    }
}
